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  <h1 class="topictitle1">周期性执行备份</h1>
  <div>
   <p>将需要保护的NAS共享关联到指定SLA，系统将对这些资源按照SLA的定义周期性执行备份。</p>
   <div class="section" id="ZH-CN_TOPIC_0000001839159869__section126131299814">
    <h4 class="sectiontitle">注意事项</h4>
    <ul id="ZH-CN_TOPIC_0000001839159869__ul4258175217589">
     <li id="ZH-CN_TOPIC_0000001839159869__li4259195214589">对于通过设备注册发现的NAS共享，如果NAS共享有认证信息，已参考<a href="zh-cn_topic_0000001792520466.html">步骤3：配置NAS共享信息</a>完成配置，否则将导致备份失败。</li>
     <li id="ZH-CN_TOPIC_0000001839159869__li13259752185815"><span style="color:#282B33;">对于NFS共享，请确认当前设备具备NFS共享目录的读写权限，并且开启了no_root_squash选项。</span>配置NFS共享访问权限的详细操作，请参见<a href="zh-cn_topic_0000001839239777.html">步骤5：配置访问权限</a>。</li>
     <li id="ZH-CN_TOPIC_0000001839159869__li14971124445917">对于CIFS共享，请确认当前设备具备CIFS共享目录的读写权限，推荐使用Administrator组中的用户进行备份，否则只能备份具有读写权限的文件和目录。配置CIFS共享访问权限的详细操作，请参见<a href="zh-cn_topic_0000001839239777.html">步骤5：配置访问权限</a>。</li>
    </ul>
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   <div class="section">
    <h4 class="sectiontitle">操作步骤</h4>
    <ol>
     <li><span>选择<span class="uicontrol" id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001839142377_uicontrol79081114124111">“<span id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001839142377_text99081414144119">保护</span> &gt; 文件系统 &gt; NAS共享”</span>。</span><p></p>
      <div class="note" id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001839142377_note397892312184">
       <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
       <div class="notebody">
        <p id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001839142377_p5978112341818">对于1.5.0版本，请选择<span class="uicontrol" id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001839142377_uicontrol129783237180">“<span id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001839142377_text10978172391818">保护</span> &gt; 文件服务 &gt; NAS共享”</span>。</p>
       </div>
      </div> <p></p></li>
     <li><span>在需要保护的NAS共享所在行，单击<span class="uicontrol">“<span>更多</span> &gt; <span>保护</span> ”</span>。</span></li>
     <li><span>选择已创建的SLA。</span><p></p><p>您也可以单击<span class="uicontrol">“<span>创建</span>”</span>，创建新的SLA。</p> <p></p></li>
     <li><span>设置高级配置参数。</span><p></p>
      <ul>
       <li><span>通道数</span><p>通道数越大，备份性能越好，相应占用生产主机内存越多，每个通道占用约200MB内存。</p></li>
       <li><span>小文件聚合</span><p>开启后，系统将同一目录下的多个小文件聚合为大文件，提升备份效率。在SLA包含了增量备份的场景下，若SLA未设置<span>永久增量（合成全量）备份</span>，则不支持关闭小文件聚合；若SLA设置了<span>永久增量（合成全量）备份</span>，则不支持开启小文件聚合。</p> <p>需要设置以下两个参数。</p>
        <ul>
         <li><span>聚合后文件大小</span>：文件聚合后的大小，可以设置为128KB、256KB、1024KB和4096KB</li>
         <li><span>最大的被聚合文件大小</span>：被聚合文件的最大值，可以设置为128KB、256KB、1024KB和4096KB</li>
        </ul> <p><span>小文件聚合应满足：聚合后文件大小 &gt;= 最大的被聚合文件大小</span></p></li>
       <li><span>SMB 硬链接保护</span><p id="ZH-CN_TOPIC_0000001839159869__p114516211462">默认开启。当待保护的NAS共享数据集同一目录下的文件数量过多时，备份任务可能失败。在此场景下，建议关闭此开关。</p></li>
       <li><span>SMB ACL保护</span><p>默认开启。当待保护的NAS共享数据集同一目录下的文件数量过多时，备份任务可能失败。在此场景下，建议关闭此开关。</p></li>
       <li>热数据备份<p>开启后，仅备份文件修改时间在备份任务执行前指定时间范围内的文件。例如：打开开关并设置为60天，则文件修改时间在备份任务执行前60天内的文件将被备份。</p></li>
      </ul> <p></p></li>
     <li><span>单击<span class="uicontrol" id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001792503842_uicontrol471113581111">“确定”</span>。</span><p></p><p id="ZH-CN_TOPIC_0000001839159869__zh-cn_topic_0000001792503842_p25041111535">如果当前系统时间已晚于该SLA首次备份的开始时间，则关联备份SLA后可以选择在当前立即执行备份或者根据SLA中设置的备份策略等待下次调度。</p> <p></p></li>
    </ol>
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     <strong>父主题：</strong> <a href="zh-cn_topic_0000001792360682.html">步骤9：执行备份</a>
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